Valve mechanism



1,595,468 F. D. HOLDSYWORTH VALVE MECHANISM Aug. 10 1926.

Original Filed Oct. 8, 1921 seating the valve.

Patented Aug. 10, 1926.

UNITED STATES PATENT OFFICE.

FRED D. HOLDSWCRTH, OF CLABEMIONT, NEW HAMPSHIRE, ASSIGNOR TO SULLIVAN MACHINERY COMPANY, A CORPQRATION OF MASSACHUSETTS,

VALVE MECHANISM.

Continuation of application Serial No. 506,465, filed October 8, 1921. This application filed September 10,

' 1924. Serial Ila-736,987. Renewed September 26, 1925.

invention relates to valve mechanism.

It has for its object to prov1de an mproved valve mechanism andmore espec ally an improved valve mechanlsm for pumps, compressors or the-like. A further'ob ect of my invention is to provide an mproved valve mechanismof the type utilizing a transversely flexed spring whereby breakageof the valve spring is elim nated.

In the accompanying drawings I have shown for purposes of illustration two embodiments Which-my invention may assume in practice.

In these drawings p I Fig. l is a artial sectional view of the compressor cylinder equipped with one form of my improvement. v V

Fig. 2 is a detail sectional view of the valve cage in position in the cylinder.

Fig. 3 is'a plan view of the'valve.

Fig. 4 comprises plan and side elevations of the valve spring.

Fig. 5 is a detail view showlng a IIlOdl: fled form of spring and valve arrangement.

In this illustrative disclosure I have. shown a compressor of standard construction including a cylinder 1 having a p ston 2 movable therein and equipped with inlet and discharge valve mechanisms 3 in a .usual manner, each of which is preferably in, the form of a cage housinga valve mechanism of the general form shown'in the illustrative discharge valve shown in detail in Fig. 2, and comprising a seat 4 having an annular series of ports 5 therein "covered'by an annular and preferably rigid valve 6 movable relative to an annular flanged guard, guide, or cooperating housing member 7 held in place on the seat bysuitable clamping means 8 and having a transversely flexed generally annular spring 9 operating between the va ve 6 and a horizontally extending annular guardor stop 10 on the guide member 7, and normally In my improved construction it will be noted that the transversely flexed valve spring 9 is cut away as at ll on opposite sides thereof, as shown in Fig. 4, and on opposite sides of a diametric line parallel to the axis of transverse flexure of the valve spring, in such a manner as, by decreasing the cross section of metal at these points,

to increase the flexibility of these portions of the valve spring relative to that of the intermediate portion, and herein form oppositely disposed extensions of reduced width 12 which are preferably slightly bent uplward to provide a line contact with the va ve.

As a result of my improvement, it will be noted that instead of concentrating the deflectionor bending action at a point along a dlametric line parallel to the axis of transverse flexure of the valve spring as wouldtend to be the case in a valve of true an nu'lar form, the deflection is distributed from the line of transverse flexure toward the ends of the valve in such a manner as to eliminate possible fatigue of the metal along "the line mentioned and any breaking of the valve springs which may tend to result therefrom, a valve spring thus being produced which, through the elimination'of the con-' irefntration of stresses, has a materially longer In the manufacture of .my' improved springs, the springs are preferably cut out by dies from the flat strips of sheet metal prior to flexing, although if desired the same may be formed by grinding away portions of the metal at the points indicated in such a manner as to reduce the cross section at those points and thereby increase the 'flexi: bility as compared with corresponding points in a spring not so cut away.

In the use ofmy improvement, it will alsobe evident that if desired, instead of having the ends ofthe valve spring engage the valve and the intermediate portion of the spring engage the guard, the spring may be reversed, having its ends engage the guard and its intermediate portion engage the valve, it being understood that in such a construction the guard will be slightlv increased in diameter to permit the desired contact as shown in Fig. 5.

This application is a. substitute for my ,copending application, Ser. N o. 506,465,filed points in a single straight line and the'other' along points in a pair of parallel straight lines at opposite sides of said first'mentioned line and comprising a bowed member initially uniform in thickness and in shape corresponding to the shape of said valve but cut away wholly exteriorly to an increasing extent at each side of said first mentioned line from points adjacent said first mentioned line to points adjacent said second mentioned lines. a

2. In a valve mechanism, a ported seat member, a spaced abutment member, a valve adapted to cooperate with said seat member, and a spring between said valve and abutment engaging one of the same along points in a single straight line and the other along points in a pair of parallel straight lines at opposite sides of said first mentioned line and comprising a bowed member ir iitially uniform in thickness and in shape corresponding to the shape of said valve but cut away wholly exteriorly to an increasing extent at each side of said first mentioned line from points adjacent said first mentioned line to points adjacent said second mentioned lines and provided with upturned portions beyond said second mentioned linesl 3. In a valve mechanism, a ported valve housing, an annular valve disposed over a port therein, and a transversely flexed generally annular spring, imperforate between its inner and outer peripheries normally seating said valve and cut away to provide portions at opposite sides of the intermediate portion thereof of greater flexibility than a transversely bowed true annulus of identical thickness and material.

4. In a valve mechanism, a ported valve housing, an annular valve disposed over a port therein, and a transversely flexed generally annular spring, imperforate between its inner and outer peripheries normally seating said valve and having portions at opposite sides of the intermediate portion thereof of, reduced cross section as compared with corresponding sections through a truly annular spring of uniform thickness.

5. In a valve mechanism, a ported valve housing, an annular valve disposed over a port therein, and a transversely flexed generally annular spring normally seating said valve and having upturned portions on opposite sides of the intermediate portion thereof and of less width than a corresponding segment of a truly annular spring.

6. In a valve mechanism, a ported valve housing, an annular valve disposed over a port therein, and a transversely flexed generally annular spring, imperforate between its inner and outerv peripheries normally seating said valve and having its intermediate portion of substantially uniform cross section and oppositely disposed relatively narrow upturned ends connected thereto by flexible portions of reduced cross section as compared with corresponding sections through a truly annular spring of uniform thickness.

7. In a valve mechanism, a ported seat member, a spaced abutment member, a valve adapted to cooperate with said seat member,

and a spring between said valve and abut ment having engagement with one of the same at a plurality of points lying in a single straight line extending transversely of said spring, the most remote points of such contact being spaced sufiiciently to prevent lateral tilting of saidspring, said spring engaging the other element contacted thereby at points on opposite sides of said straight line, and comprising a bowed member initially uniform in thickness and in shape corresponding to the shape of said valve but cut away wholly exteriorly to an increasing extent at each side of said line from points adjacent the latter to points in lines parallel to said first line and including said points of contact with the other element contacted by said spring.

In testimony whereof I affix my signature.

FRED D. HOLDSWORTI-I. 

